Keywords: Hittorf portrait from Festschrift 1904.jpg en Taken from the special issue in honour of the 80th anniversary of Hittorf's birth Leipzig Barth 1904 Preface by Adolf Heydweiller Münster Ed <br> J W Hittorf and J Plücker On the spectra of ignited gases and vapours with especial regard to the same elementary gaseous substance Phil Trans Royal Soc London 155 1 1865 de Entnommen der Festschrift zum 80 Geburtstage Johann Wilhelm Hittorfs Leipzig Barth 1904 Vorwort von Adolf Heydweiller Münster Hrsg zum Neudruck von <br> J W Hittorf and J Plücker On the spectra of ignited gases and vapours with especial regard to the same elementary gaseous substance Phil Trans Royal Soc London 155 1 1865 Special issue in honour of the 80th anniversary of Johann Wilhelm Hittorf's birth Leipzig Barth 1904 http //wellcomeimages org/indexplus/imageM0014847 html author contemporary Published Leipzig Barth 1904 Scan 300 dpi of the original frontispiece PD-old Cc-by-4 0 Johann Wilhelm Hittorf |